Why can't I edit my poll?

I've tried to add images to a poll I'd previously made too, and couldn't. My guess is that you can't alter the poll in any way, to prevent people from changing a poll which isn't going their way. It's a bit silly really. I could understand not changing the question or the answer option for that reasoning, but altering images won't change the poll results in any way.

just restart your computer and try again it always works with me
hopefully this helps...

How long ago did you post the poll? If you did it a few hours ago, then it's stuck like it is. If you just recently made it then it's a glitch (and a very common glitch from what I've experienced. Happens to me all the time).